NaI(Tl) Scintillator's Response Functions for Point-like and Distributed Gamma-ray Sources
| Autor: | J. M. Ortiz-Rodriguez, Jorge Luis Benites-Rengifo, Hector Rene Vega-Carrillo, V. M. Hernández-Dávila, H. A. de Leon-Martínez |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Spectrometer Detector Monte Carlo method Solid angle Gamma ray Scintillator 010403 inorganic & nuclear chemistry 01 natural sciences 030218 nuclear medicine & medical imaging 0104 chemical sciences law.invention Computational physics 03 medical and health sciences Portland cement 0302 clinical medicine law Calibration |
| Zdroj: | Journal of Nuclear Physics, Material Sciences, Radiation and Applications. 4:129-137 |
| ISSN: | 2321-9289 2321-8649 |
| DOI: | 10.15415/jnp.2016.41013 |
| Popis: | The response functions of a NaI(Tl) detectors have been estimated using Monte Carlo methods. Response functions were calculated for monoenergetic photon sources (0.05 to 3 MeV). Responses were calculated for point-like sources and for sources distributed in Portland cement cylinders. Calculated responses were used to estimate the detector efficiency for point-like and distributed sources. Samples of cylindrical Portland cement were prepared and exposed to the photoneutron field produced by a 15 MV linac used for radiotherapy. Short half-life radioisotopes were induced and the activity was determined by measuring the pulse-height spectra with a NaI(Tl) g-ray spectrometer that was calibrated using point-like sources. Instead of doing corrections due to differences between the geometry, material and solid angle of point-like sources used for calibration, and the Portland cement cylinders, the detection efficiency was determined using the ratio between the efficiencies for the point-like and the distributed sources estimated with the Monte Carlo calculations, and the activity of the induced isotopes in cement was obtained. |
| Databáze: | OpenAIRE |
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